Use more explicit warning regarding serialization warning for missing fields

[sydney-runkle]

Fix pydantic/pydantic#10192

Now:

pydantic_core._pydantic_core.PydanticSerializationUnexpectedValue: Expected 3 fields but got 2 for field Pipeline of type `Side_with_init` with value `Side_with_init(Name='Remove', With_init='TestRemoveOptional')` - serialized value may not be as expected.

Before:

pydantic_core._pydantic_core.PydanticSerializationUnexpectedValue: Unexpected Value

Also:

• Fixed bug where field_namewas nullified in extra for model serializers
• Standardized truncating string logic via tools function

[davidhewitt]

Potentially can benefit from a test?

[codspeed-hq]

CodSpeed Performance Report

Merging #1415 will not alter performance

_{Comparing better-warning-for-missing-field (63f108d) with main (4113638)}

Summary

✅ 155 untouched benchmarks

[BoxyUwU]

+1 to a test being nice, its hard to see what the change in output actually looks like in practice